Got it Working,
downloaded the image via GUI
https://uk.lxd.images.canonical.com/images/openwrt/snapshot/
created the conatainer
pct create 100 /var/lib/vz/template/cache/openwrt.tar.xz --arch amd64 --hostname ct-openwrt --rootfs local-lvm:202 --memory 512 --cores 1 --ostype unmanaged --unprivileged 1
added 2 Networkcards via GUI
added nesting and keyctl
The Snapshot Version did the Trick
BTW in Snapshot is Luci missing
Have Fun